South Harrow Tube station remains closed eastbound for a second day on Thursday (March 3) morning due to a damaged platform.
The eastbound platform was closed on Wednesday (March 2) morning and Transport for London has said the cause of the damage remains under investigation.
A spokesman for TfL said it was working hard to repair the platform as quickly as possible to make it safe for passengers, but he was unable to say when it was likely to reopen.
Tony Matthews, general manager of the Piccadilly line, said: "I apologise to Piccadilly line customers for the temporary closure today of the eastbound platform at South Harrow Tube station as it's damaged.
"The safety of our customers is our top priority which is why we have closed the platform before we repair it after close of service on the Piccadilly line tonight. Westbound trains are serving the station as usual. We are investigating the cause of the damage."